voronoiTreemap: Voronoi Treemaps with Added Interactivity by Shiny

The d3.js framework with the plugins d3-voronoi-map, d3-voronoi-treemap and d3-weighted-voronoi
are used to generate Voronoi treemaps in R and in a shiny application.
The computation of the Voronoi treemaps are based on Nocaj and Brandes (2012)
<doi:10.1111/j.1467-8659.2012.03078.x>.